Use of IPv6 for worker ip address

[NickFitton]

Issue

Workers were failing to connect to scheduler

Cause

Workers were trying to give the scheduler an IPv6 address to callback on

Resolution

Add functionality to only allow InetAddress classes that are instances of Inet4Address

Also

• Make some thrown exceptions less generic
• Ignores a test that fails due to integration with Cineast not being up-to-date

Next PR

• Make indentation 2 spaces, code cleanup

[lucaro]

Is there a particular reason to reject all IPv6 addresses entirely?

[NickFitton]

Is there a particular reason to reject all IPv6 addresses entirely?

The IPv6 that is returned has the port attached which the scheduler did not like.
2a02:c7f:149c:8a00:a117:1300:d051:3e9c%wlp3s0
I don't know enough about IPv6 to fix this but it could be something I can look in to later in my work